These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
In 1999, Russian president Boris Yeltsin dismissed his prime minister and promoted former KGB officer Vladimir Putin in his place. In December 1999, Yeltsin resigned, appointing Putin president, and he was re-elected in 2004. In April 2005, he made a historic visit to Israelâthe first visit there by any Kremlin leader.